RE: inverted engines
BTW...... There is never any excuse for us to flood our crankcases through the carb. Even if you have an electric fuel pump that puts out 50 gallons per second and would spray wash a cement truck from 20 yards, we got no excuse.
Our engines have crankshaft induction. Well, most of them do. And those crankshafts are connected to the props. And we can turn those props anywhere we want them.
So take a couple of seconds and see where the prop is when the crankshaft is closed. When you fuel that baby next time, put that prop where the crank is closed and not a drop of fuel is going to be forced into the case.
And if the engine is oriented such that the fuel collects over that closed hole, figure it out. Maybe you can dump it by tilting the model etc etc etc.
But some engines are 4strokes and the intake goes directly to the head. No worries mate. Figure out where to position the prop so the intake valve is closed etc etc